Power Short Inspection (Power Unit Can)

Wiring diagram: 

CAN communication system Refer to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the central gateway Control Module connector.
   3. Turn the ignition switch to ON.
   4. Using a tester, measure the voltage between the central gateway Control Module connector and chassis ground.

      Connector & terminal 

      (i88) No. 23 (+) - Chassis ground (-):

      (i88) No. 24 (+) - Chassis ground (-):

   Is the voltage 5 V or less?

   Yes:  Go to  3.

   No:  Go to  2.

2. CHECK CONTROL MODULE  .

   With the tester connected, disconnect control module.

   Connector & terminal 

   (i88) No. 23 (+) - Chassis ground (-):

   (i88) No. 24 (+) - Chassis ground (-):

   Did the voltage change to 5 V or less?

   Yes:  Replace the control module whose voltage has changed.

   No:  Repair or replace the short circuit of the harness between the central gateway Control Module and ECM.

3. CHECK CENTRAL GATEWAY Control Module  .
   1. Connect the central gateway Control Module connector.
   2. Disconnect the VDC Control Module connector.
   3. Using a tester, measure the voltage between the VDC Control Module connector and chassis ground.

      Connector & terminal 

      (B66) No. 5 (+) - Chassis ground (-):

      (B66) No. 19 (+) - Chassis ground (-):

   Is the voltage 5 V or less?

   Yes:  Currently, it is normal.

   No:  Replace the central gateway Control Module. Refer to BODY CONTROL/COMMUNICATION SYSTEM>GATEWAY Control Module .